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Answer

I am assuming you are using WinVista/7/8/10m so follow the steps:
1) Hit the start button. Type “services.msc” and run it.
2) In Services, right-click “FLEXnet Licensing” and click “Stop”.
3) Hit the start button again. Type “taskmgr.exe”
4) In the processes tab, look for “LMU.EXE”. If you see it, right-click it and select “End Process”.
5) Open an explorer window (or go to “My Computer”). In the address bar, type “C:\ProgramData”
6) Delete the “FLEXnet” folder completely.
7) Relaunch Maya. It will have you re-activate.